\begin{table}
\centering
\begin{tabular}[t]{lcccc}
\toprule
  & NL & DE & UK & US\\
\midrule
(Intercept) & \num{1.898}*** & \num{1.682}*** & \num{1.701}*** & \num{1.801}***\\
 & (\num{0.044}) & (\num{0.036}) & (\num{0.023}) & (\num{0.029})\\
treatfac1 & \num{0.534}*** & \num{0.687}*** & \num{0.606}*** & \num{0.619}***\\
 & (\num{0.075}) & (\num{0.056}) & (\num{0.038}) & (\num{0.047})\\
round.fac2 & \num{0.042} & \num{0.337}*** & \num{0.211}*** & \num{-0.220}***\\
 & (\num{0.063}) & (\num{0.051}) & (\num{0.033}) & (\num{0.041})\\
treatfac1 × round.fac2 & \num{0.227}+ & \num{-0.031} & \num{0.004} & \num{-0.067}\\
 & (\num{0.133}) & (\num{0.090}) & (\num{0.065}) & (\num{0.080})\\
\midrule
Num.Obs. & \num{2263} & \num{2506} & \num{3168} & \num{3143}\\
R2 & \num{0.146} & \num{0.192} & \num{0.143} & \num{0.103}\\
R2 Adj. & \num{0.145} & \num{0.191} & \num{0.143} & \num{0.102}\\
AIC & \num{6519.9} & \num{6419.6} & \num{7475.3} & \num{8539.5}\\
BIC & \num{6548.5} & \num{6448.7} & \num{7505.6} & \num{8569.8}\\
RMSE & \num{0.82} & \num{0.78} & \num{0.79} & \num{0.94}\\
Std.Errors & by: IDvar & by: IDvar & by: IDvar & by: IDvar\\
\bottomrule
\multicolumn{5}{l}{\rule{0pt}{1em}+ p $<$ 0.1, * p $<$ 0.05, ** p $<$ 0.01, *** p $<$ 0.001}\\
\end{tabular}
\end{table}
